Tires of Wisdom

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The newest race-spec Dunlop GPA's allow the rear tire to be mounted in either direction (bi-directional). Most tracks are much harder on one side of the tire than the other. A tire can get worn down very quickly, and while one would never usually do this for a race, privateers looking to get the maximum useful life from a tire will flip them the opposite direction and get another weekend of practice. It's mentioned as a benefit on Dunlop's racing tire website. These tires can be run as low as 21 psi for the rear, even lower depending on conditions.

http://dunlopracing.com/tires-products/gpapro/